Sell the 260, go 460 1GB
Edit:
The 1GB 460 has both more memory, and a wider memory bus, plus more rops, overall it's a significantly faster card than the 768mb version.
And the switch to Gddr5 from gddr3 means that the 256bit interface on the 1GB version is just as fast as the 448 bit on the 260. 111.9GB/s for the 260, 115.2GB/s for the 1GB 460, but only 86.4GB/s for the 768mb 460.
As far as fill rate goes, 21.6 vs 16.1 gigapixels per second is another clear win for the 460.
37 (or 41 for the 216 core) gigatexels vs 38 for the 460 means the 216 core 260 wins on that, the others are pretty even.

Add in the fact that the 460 clocks like a demon, and adds DX11, I'd say the 1GB 460 is looking a decent winner. Sell the 260 and get a pair of 460s Edited by allikat - 10/5/10 at 6:02am

Sell the 260, go 460 1GB
Edit:
The 1GB 460 has both more memory, and a wider memory bus, plus more rops, overall it's a significantly faster card than the 768mb version.
And the switch to Gddr5 from gddr3 means that the 256bit interface on the 1GB version is just as fast as the 448 bit on the 260. 111.9GB/s for the 260, 115.2GB/s for the 1GB 460, but only 86.4GB/s for the 768mb 460.
As far as fill rate goes, 21.6 vs 16.1 gigapixels per second is another clear win for the 460.
37 (or 41 for the 216 core) gigatexels vs 38 for the 460 means the 216 core 260 wins on that, the others are pretty even.

Add in the fact that the 460 clocks like a demon, and adds DX11, I'd say the 1GB 460 is looking a decent winner. Sell the 260 and get a pair of 460s

I Have the EVGA gtx 460 768mb SC overclocked to 858/1716/2080,see the reviews of this card and you will see that this card is faster or equal a couple of 1gb models